The .NET CLI explicitly emits telemetry.

https://docs.microsoft.com/en-gb/dotnet/core/tools/telemetry

Not the most straightforward way to do it, but Nixpkgs have analytics off by default on most applications. Still waiting on one of my additions for Gatsby's disabled analytics to get reviewed and merged though.

If there is, I couldn't find it.

It'd be awesome if there was a standard "doNotTrack" style variable for CLIs.

With wrangler we went with WRANGLER_SEND_METRICS, as well as a user prompt to opt in/out.

AWS SAM CLI:

    export SAM_CLI_TELEMETRY=0